Arg! I want to see more of your rifle!
I'm building one too and to my knowledge there there are only 4 r-101c's. 3 in the making and 1 finished. there's mine, yours, TheBearMan's in the making and nick brick's completed Lego model.
I don't know of any others but if you or anyone else knows of other ones tell me, I'd love to see what others did.